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 OSP CT-04c Cable Tester Speakon XLR TRS Cat5 US $39.99 
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LED XLR cable tester?
Today my professor showed us how to set up a LED XLR cable with a 9v battery, a switch to test each of the three needles, a LED that will light up if for when each of the three needles in the cable are working when they are touched, and a resister thats 360 Ohms.
For homework he wants us to figure out a set up: Can't use a 9v battery, no switch (have to test all 3 of the needles in the cable at once, hooked to a 80 Ohms LED, and with no resister.
I am stuck and would appreciate any help, Thank you.
It is hard to figure out what the exact assignment is...does he want you to build a tester that tests the continuity of XLR mic cables using only an LED? That is basically impossible - you need some type of voltage to make the LED light up no matter what.
If you have an audio mixer nearby, you could use the phantom power produced by the mic input channel to light the LED but you still will need a current limiting resistor. That would work but I don't know if that fits what the assignment is. The phantom power puts 48 volts dc on pin 2 and 3 of the XLR cable.
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